Purple Bruises on Your Forearms After 60: Actinic Purpura Explained

They show up on the backs of the hands and the tops of the forearms: flat, dark purple patches, sometimes from a bump you felt, often from one you didn’t. Doctors call them actinic purpura, also known as senile or Bateman purpura, after the doctor who described it in 1818.¹

Why they happen

Years of sun damage the connective tissue in the deeper layer of the skin, the tissue that cushions small blood vessels, so they leak with very little force.¹ That’s why the patches stay on sun-exposed skin, mostly the backs of the hands and the outer forearms.¹ Each patch normally fades within about 3 weeks.¹

It’s common. A 2011 trial put it at more than 10 percent of people over 50.² In a study of 315 adults aged 60 and up in Mexico, 29% had dermatoporosis, the wider fragile-skin pattern that includes thin skin, purpura and white starburst scars, and 70% of them were women.³ Linked factors included age over 75, years of sun, blood thinners or antiplatelet medicines, oral steroids and chronic kidney disease.³

What small trials found

What was tried	Who	What happened
Citrus bioflavonoid pills, twice a day for 6 weeks	67 people finished2	Purpura patches fell 50% from the start2
5% vitamin C cream, twice a day for 12 weeks, one arm or leg vs placebo on the other	18 people over 604	Visible improvement in the skin4
Intense pulsed light, 4 weekly sessions on one forearm	5 people over 655	Bruised area shrank at least 50% on the treated arm5

All three are small and short. The pill trial tested one commercial blend, and its abstract doesn’t say how the placebo group did.² The light study had five patients.⁵ None of these is a standard treatment yet.

The cheapest steps come from the cause: sun protection for the hands and forearms (see how to choose and use sunscreen), long sleeves for gardening, and fewer knocks. For skin that splits as well as bruises, see skin tears and thin skin.

Bruises that need a check

Aspirin, warfarin, heparin, antiplatelet medicines such as clopidogrel, and steroids can all add to bruising.⁶ Don’t stop any of them on your own; bring a list to your prescriber.

Contact a clinician if bruising appears suddenly for no reason, or if a bruise doesn’t go away.⁶ A visit may include a complete blood count with a platelet count.⁶ Bruises in places the sun doesn’t reach, like the trunk or thighs, pinpoint red dots, or bleeding gums are a different pattern from forearm purpura and are worth a prompt visit. See how to do a skin self-exam.

Try: “I get purple patches on my forearms from tiny bumps, and I take a daily aspirin. Is this actinic purpura, and do I need a blood count?”

Skin, Head to Toe teaches you to sort a skin change by where it is, how it looks and how fast it came, and by the company it keeps. In Chapter 4, “Four Boxes,” easy bruising alongside other body changes is a Clue, not a Normal. Its Skin Log has a dated row for each patch, so you can show whether new ones stay on sun-exposed skin and fade in weeks. See the book.