What is diffuse alopecia? Alopecia is the medical word meaning hair loss. Alopecia is diffuse if it affects the scalp in a general distribution. This is in contrast to localised or focal alopecia, which is characterised by patchy hair loss. Who gets diffuse alopecia? Diffuse alopecia is common, affecting up to 50% of men and women. While it can affect both sexes at any [...]