Home How to Heal Bruises Bruising on Legs Causes and How to Stop Waking Up with Bruises on Legs

Bruising on Legs Causes and How to Stop Waking Up with Bruises on Legs

by Dr. Joe Morales

Random, unexplained bruising on legs is a problem that some people know only too well. If you are one of them, then you have come to the right place. This article will detail the common causes of bruises and highlight the various treatment options

What Causes Random Bruising on Legs?

So you woke up in the morning only to find yourself with yet another random set of dark marks that left you wondering, “What causes random bruising on legs?” Well, several causative factors may be to blame for your woes. These are detailed below:

Injury: Bruises appear when small blood vessels (capillaries) close to the surface of the skin get broken as a result of injury, strenuous activities, or from the force of impact and leak blood out into the surrounding tissues.

They appear as a dark red, black, or purple discoloration. It might be some days before blood rises close to the surface of the skin and be visible as a bruise. Sometimes the bruise spreads downwards under gravity. It takes 2 to 4 weeks for bruising to heal. During this process, the body reabsorbs the blood which gives rise to a variety of color changes.

Legs and arms are the most common trouble spots in as far as bruising is concerned. Bruised legs typically take longer to heal than other areas of the body such as arms and face.

Frequent Unknown Bruises on Legs

An injury is an obvious cause of bruises, but what about those bruises that appear on your legs without any known causes of injury? Well, causes for frequent and unknown bruising on legs range from underlying medical conditions to lifestyle factors including:

Aging: Bruising on legs is often a consequence of the natural aging process. Older adults tend to bruise more easily than their younger counterparts. Even a minor injury is enough to cause them significant bruising, especially those sustained to the legs, arms, feet, and forearms.

This is because as the body ages, the skin becomes thinner and less flexible due to loss of fat from beneath the skin and decreased the production of collagen. As fats decrease, their cushioning effect to blood capillaries also decline.

This coupled with the skin damage from lower collagen production and longtime exposure to the sun makes blood vessels particularly vulnerable to ruptures which culminate in bruising.

Medications: Aspirin and other blood thinning medications such as warfarin and clopidogrel reduce the ability of blood to clot by impairing the function of platelets. Consequently, any damaged capillaries take longer than usual time bleeding. This allows enough blood to leak out of the capillaries, ultimately resulting in a bruise.

Some dietary supplements e.g. as ginkgo and fish oil have also been shown to have a similar effect. Corticosteroids may also be to blame for thinning of skin which then makes it more susceptible to bruising. These include the drugs used to treat conditions such as asthma, eczema, and allergies.

Vitamin deficiency: Vitamins serve the role of co-factors in numerous body processes and having inadequate quantities of vitamins B12, C, and K can make blood vessels, particularly capillaries, weak leading to easy bruising.

UV damage: The UV radiation emitted by the sun damages skin and often causes sunburn and other related problems such as dark spots, fine lines, and wrinkles. That is not all though; the damages sustained to the skin and blood vessel is often a precursor to frequent, easy and unknown bruising, so to speak.

Itching and Bruising on Legs

Itching and bruising on legs or any other part of the body may be a sign of a serious liver problem called primary biliary cirrhosis, commonly abbreviated as PBC.

This is an autoimmune problem that is marked by chronic inflammation and ultimately scarring of the bile ducts within the liver. The exact cause of the condition is unknown but scientists have ruled out diet and alcohol as potential triggers. Women are 10 times more prone to develop the condition than men.

PBC tend to appear more between the age of 35 and 60 years and while there is no cure, several measures can be undertaken to slow down its progression and relieve the symptoms.

In addition to itching and easy bruising, other symptoms associated with the condition are jaundice, skin pigmentation, indigestion, fatigue, and weight loss.

If you have itching that is accompanied by bruising on legs, your best course of action is to see your doctor proper diagnosis and treatment.

Leukemia Bruising on Lower Legs

Leukemia (cancer of the blood cells) is yet another common cause of sudden, unexplained bruising.

This is a blood disorder that begins in the bone marrow when the normal development of stem cells into white blood cells. This goes on until the abnormal white blood cells overtake red blood cells (which transport oxygen to the body) and platelets (which aid in clotting of blood).

Common symptoms of leukemia include excessive bleeding, frequent infections, and easy bruising of the limbs, including legs.

Bruised Vein in Leg and Blood Clot

A bruised vein leg coupled with a blood clot – as one of our readers describe his symptoms in the comments section of another related article – may be an indication of a condition known as superficial thrombophlebitis.

This occurs after a superficial vein (commonly the long saphenous vein in the leg or one of its branches gets inflamed and the blood within it clots. This can result from injuries to blood vessels due to trauma or infection.

People who smoke tobacco and those with obesity or thrombophilia are at an especially higher risk of developing this condition. The condition is also associated with other conditions such as varicose veins but it can as well occur spontaneously.

Waking Up With Bruises on Legs

“I don’t know if my diet is the problem or what, but I woke up this morning and noticed random bruises all over my legs, but they are most notable on the calves. I am really confused because I didn’t injure myself at the football game yesterday; about that I am sure. What could be going on? Someone told me it could from vitamin deficiency. What is your take?” Thomas

Well, judging from your involvement in football, the natural aging process is very likely not to blame for your bruising.

If you are taking some medications such as aspirin or ibuprofen, they could be to blame for the unusual bruises on legs. Deficiency in vitamin C, K, or B12 could as well be the underlying cause. It might be a good idea to incorporate foods rich in these vitamins in your diet.

Just apply cold compresses (ice pack wrapped in a towel) on the bruises for two days and apply warm compresses (towel soaked in warm water) thereafter while taking acetaminophen (if necessary to relieve pain) and keeping the leg elevated. If the bruising takes more than 2 weeks to improve, seems to get worse, or keeps recurring for no apparent reason, talk to your doctor.

It might be a sign of an underlying condition such as diabetes, leukemia, etc.

Large Red Bruises on Leg without Injury

“Lately I seem to be getting bruises for no apparent reason. I get these ugly blue-black discolorations even when I have not sustained any injury at all. Is it something I should be concerned with or even see my doctor about? I am 65 and in excellent health.”

At 65 years of age, it is likely that the natural aging process is taking a toll on your skin leading to the bruising. It could also be the result of long-time exposure to sun’s UV radiation, especially if you have been engaging in an outdoor occupation and/or activities.

If you have been taking some blood-thinning medications such as aspirin, corticosteroids (e.g. prednisone), and warfarin, then they could as well be the culprits. You should go back to your doctor and talk with him/her about it.

Lastly, this could be the result of medical conditions such as diabetes, leukemia, Grave’s disease, and cirrhosis among others. It is advisable to talk to your doctor about the bruises.

How to Get Rid of Bruises on Legs

Before we explore how to get rid of bruises on legs, let’s start by reiterating that bruises require no specialized medical treatment as they typically heal on their own within 2-4 weeks. The following measures are only aimed at controlling symptoms associated with bruising on legs such as swelling and making you more comfortable.

  • Apply cold compresses on the bruising 3 times a day or so in the first 48 hours to reduce swelling and stop bleeding by constricting the injured capillaries. This simply entails placing an ice pack wrapped in a washcloth or towel on the affected area for 20 minutes.
  • Apply warm compress after 48-72 hours of cold compress treatment. This helps the body to reabsorb the blood cells collected underneath the skin by increasing blood flow to the affected area. Simply place a washcloth or towel dipped in warm water on the skin for 15 minutes or so several times a day.
  • Restrict blood flow:   Bruising on legs respond well to maintaining an elevated position for the leg. This helps to reduce swelling. Just be sure to keep the leg elevated as much above the heart as you can; preferably by staying in a lying position with the leg still elevated.
  • Take anti-inflammatory medications: Acetaminophen is preferred for relieving pain but never aspirin as its thinning effect on the blood can worsen the bruising.

When to seek medical attention

The following scenarios warrant the attention of your doctor:

  • You experience excessive bruising characterized by particularly large marks
  • Sudden bruising that tends to recur on the legs frequently
  • The bruises take an especially long time to heal; 2-3 weeks is acceptable but anything longer than that is a cause for concern
  • The bruising on legs is accompanied by unusually heavy menstruation periods or bleeding gums.

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Leave a Comment


Tizzie May 25, 2016 - 9:01 am

I’m 25 and normally I’m pretty accident prone but have not had any accidents that I know about that would explain the amount if bruising on my legs, they start out as vein streaks and the bruises come in stages, first vein streaks, then a dot bruise and it grows up from there to a massive nasty one every time. The only two injuries bruises I know of are when I fell off my bine but those are supposedly healed but now scarred the bruises are scarred, but these other ones are all over and like I said start as vein streaks and progressively grow into nasty large black ones…should I be concerned? I do take some psych meds such as adderal, fanapt, strattera, lamictal, a couple other ones

olivia Jun 20, 2016 - 3:49 pm

Im having the same proublem im 25 and take concerta for my add I I bruse easly but have done any that would cause them wake up with big one all over my legs more then one there no explanation for them really big and nodsible on my right leg and and small nosdible on my left leg should I be concerd and see a doctor

Vineet Aug 24, 2017 - 4:35 am

Hi olivia…I myself is also effect the same problem..
Will you plz tell me what doctor told you..I m very worried…plz consult me

Noahleen Berry Aug 20, 2016 - 4:59 pm

The long, wide bruises above the knee. My daughter 41. She took two dayabout month ago over 12 pills in 24 hrs. What best way to know not serious?

KX Aug 31, 2016 - 3:00 am

low iron can cause bruising on legs.

Elonda Oct 28, 2016 - 2:13 pm

Hi everyone. I’m not sure how the bruises are coming and they pop up on my arms not legs. There is no abuse going on anyway guess I better see a doctor I have had blood clots in the past and it’s scary though I pray for all of us to become bruise free?

Kathy Dec 1, 2016 - 9:07 am

I’m 43 years old .. I just started to get the spots on my body frome the waste down . Sometimes on my arms but those are not that bad. The ones on my breast are the ones that hurt the worse. I can just scratch one time as if I’m having an regular itch ok n the skin. My body itches mostly on my head and feet well the toes. Now I’ve get the chills a lot of the time .But when I covery up I get real hot. . But when I get the spots on my legs. They hurt you can’t see them yet but then a little reddish welt shows up. That’s when the itching starts. After that is when the bruises appear on my legs and still itch like crazy. . They started out real small.Then as time has gone by.They rang in size of a dime to the size of a softball. And started with just one at a time,but now the most I’ve had at one time is 13…. SOME ONE PLEASE HELP ME . Don’t know what to do….. Want to know if there is anyone out there that knows what the heck I have. ..

Lisa Sanders Jan 13, 2017 - 6:28 am

Im doing the same thing Kathy im 36 and this is never happened to me befote

Nicole Griffin Mar 21, 2020 - 3:14 am

Me too except my red spots started on the top of my , then stomach . Thigh area ,a few on arms . They all look like red spots or purple bruises I get extremely hot , fatigued, diarrhea, swelling everywhere , vomiting from acid indigestion. Also fast heart beAt which takes my breath away just going to take the trash out . I only weigh about 135 and am 37 .i assume blood infection or high blood pressure

Alisha May 14, 2019 - 1:16 am

I’m not sure but I have the same problems Iam going to check with my doctor

Marilyn Dec 2, 2016 - 2:42 am

I woke up yesterday wtth an almost black dark red solid bruise from just below my knee covering 1/2 of my leg. I have been on a blood thinner for almost 20 years following a heart attack,stents and subsequent bi-pass surgery. Isn’t that too many years of blood thinning? My Dr says nothing regarding lowering or discontinuing this med

Nicole Griffin Mar 21, 2020 - 3:17 am

I would definitely listen to the doctor blood thinners is something that can kill you fast if you stop take them or change your dosage yourself but uou can always get a second opinion from another doctor

Glenda Isbell Jun 11, 2018 - 6:30 am

I have a pencil size one and tests are in order yet I become concerned about a quality facility so I just am not sure what to do either with these symptoms and have a history of diabetes, early cirrhosis 37 years ago, pancytopenia just 5 years ago.

Lori Resurreccion Sep 1, 2019 - 11:06 pm

My husband is 80. He is diabetic, takes pills daily for diabetes and two heart meds to thin his blood and has a pacemaker. Two weeks ago, he fell against something solid and hit the out side of his leg (below calf). He sustained a goose-egg of a bump then after a couple of weeks, we noticed there is a collection of dark blood at the base of his foot on the same side as the bump. Now there is also blood up and down his leg in the back.

Joe Morelli Dec 4, 2019 - 8:19 am

I have had what look like bruises for a few years. Very tired sometimes but also have sugar. Ny bruises are only on my lower legs and they don’t hurt at all

Nicole Griffin Mar 21, 2020 - 3:20 am

Is anyone swelling in abdomen or legs . Dizziness , nausea?

Marissa Jun 2, 2021 - 12:46 pm

Have been tested for autoimmune disorders, blood disorders etc, no explanation why I get massive bruises all over my legs, every other day there is a new one. I am also pretty itcy on my legs at times and itching even the slightest causes even more bruising. Chronic pain an fatigue are issues as well. Otherwise healthy. No one knows what the issue is but its pretty alarming and gross in the summer. I look like I have been beaten. I am a 27 year old female.