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Women tend to bruise more easily than men. This is because women have more fragile blood vessels and may bruise more easily on their legs, upper arms, or buttocks. Dr. Blahd says that if you have no other symptoms, then random bruising is nothing to worry about.
Bleeding disorders
Bleeding disorders may cause large bruises to develop without any explanation. For example, hemophilia and Willebrand disease affect the blood’s ability to clot and can cause bleeding and excessive bruising resulting in black or dark skin patches.
However, unexplained bruising by itself isn’t the only symptom of a bleeding disorder. The National Hemophilia Foundation says that along with excessive bruising, hemophiliacs usually have unexplained nosebleeds, extended bleeding from minor cuts and scrapes, and women may have very heavy menstrual periods.8
Too much sun
Although being in the sun is necessary to help the body produce vitamin D, too much sun exposure can damage your skin and cause you to bruise easily. Sunburn can take a long time to heal and its effects can be long-lasting.
The website Drugs.com warns that long-term overexposure to the sun’s harmful UV rays can cause the skin to bruise easily on exposed areas. This can even cause permanent discoloration to your skin. If you notice abnormal bleeding under your skin after a sunburn, you should call your doctor for a checkup.9
If your skin shows signs of a sunburn, like reddened skin, skin tender to touch, and blisters, you can get relief from sunburn using natural remedies like aloe vera, honey, witch hazel, or oatmeal.