Dandruff Vs. Dry Scalp on Bald Heads: Dermatologists Settle the Debate

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Without hair to diffuse ultraviolet radiation, the bare head absorbs enormous doses of UVA and UVB rays. Chronic, unprotected sun exposure damages cellular DNA, degrades collagen, and induces solar keratosis or acute sunburn peeling. Sun-damaged skin cannot maintain adequate hydration levels, which speeds up transepidermal water loss.

In response to extreme dehydration from sun and harsh soaps, the skin activates a defense mechanism: rebound sebum hyperproduction. The sebaceous glands pump out excess oil to compensate for the missing moisture barrier. This creates an ironic paradox: a chronically dry scalp that feels parched beneath a layer of greasy oil. That sudden oil surge creates the exact biochemical environment required for dormant Malassezia to bloom into full-blown seborrheic dermatitis. In this scenario, dehydration directly seeds a fungal infection.