There are also scarring alopecias, says Goh, which also cause bald spots, often with itching, tenderness and redness, and sometimes pimples on the scalp.
—
Sydney Lupkin,
NPR,
23 Nov. 2025
Like all pimples, blackheads occur when a mixture of dead skin cells and excess skin oils block the exit of a pore.
In animals, the bacterium causes pustules and lesions, predominantly in cattle, sheep, and horses.
—
Helen Branswell,
STAT,
11 May 2026
In fact, one of the most common triggers of rosacea, which is characterized by flushing, swelling, spider veins, papules, and pustules, is exposure to sunlight.
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