Patchy
hair loss caused by skin disease
Scalp ringwormInflammation,
often with pustulation, is a feature of animal ringworm, and the resultant
scarring can be severe. The classical scalp ringworm derived from human sources
causes areas of scaling with broken hairs.
The
rough removal of adherent scales can also remove hairs, but regrowth is the
rule.
Hair
follicles can be damaged in many ways. If the follicular openings can no longer
be seen with a lens, regrowth of hair cannot be expected.
Sometimes
the cause is obvious: a severe burn, trauma, a carbuncle or an episode of
inflammatory scalp ringworm. Discoid lupus erythematosus, lichen planus and morphoea
can also lead to scarring alopecia. The term ‘pseudopelade’ is applied
to a slowly progressive non-inflamed type of scarring which leads to irregular
areas of hair loss without any apparent preceding skin disease. If inflammation
is present, a biopsy may help to estab-lish the diagnosis.
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