Bruising more easily in perimenopause: thin skin or something else

Why thinner skin bruises

Small blood vessels in the skin are supported by the collagen and connective tissue around them. That surrounding matrix acts as scaffolding, limiting how much a vessel moves and how easily it tears.

With around 30% of skin collagen lost in the first five postmenopausal years, that scaffolding is measurably reduced. Vessels rupture under less force, and blood that escapes spreads more freely through the thinner tissue, producing a larger mark from a smaller knock.

The fat layer beneath the skin also thins in some areas, removing cushioning that previously absorbed impact.

The classic distribution

Bruising from this mechanism typically appears on the forearms and backs of the hands, often as flat purple patches that resolve leaving a brownish stain rather than going through the usual colour sequence.

This distribution is not coincidental: those areas have the most cumulative sun damage, which independently degrades collagen, and the least underlying fat. Sun exposure over decades is a larger contributor here than most people expect.

What else causes easy bruising

Several causes are common, and some are the sort of thing nobody connects to bruising:

• Medications: anticoagulants, antiplatelets including aspirin, and regular anti-inflammatory painkillers
• Corticosteroids, including inhaled and topical with long-term use, which thin skin markedly
• Supplements with antiplatelet effects, including fish oil, ginkgo, garlic and vitamin E in high doses
• Alcohol, both directly and through effects on the liver and platelets
• Low platelet count or a clotting disorder
• Liver disease, which impairs production of clotting factors
• Vitamin C deficiency, uncommon but a genuine cause of fragile vessels

Which bruising is not just thin skin

The pattern matters more than the number of bruises:

• Bruises on the trunk, back or face, where knocks are less likely
• Bruises with no recall of any injury at all, repeatedly
• Very large bruises, or lumps under a bruise
• Bruising alongside bleeding gums, frequent nosebleeds, or heavy periods
• Sudden onset of easy bruising in someone who never bruised easily
• Bruising with fatigue, weight loss, fever or frequent infections

When to see someone

Ask for a full blood count and clotting screen, plus liver function, for any of the patterns above. These are quick tests and they settle most of the question.

Review your medications and supplements with a pharmacist — the combination of an anti-inflammatory, aspirin and fish oil is common, and its combined effect on bruising is rarely joined up.