One of my strawberry birthmarks hurts (one top of head) scalp sunken in with mound around it that is painful. Alopecia is spreading. Clueless?

See dermatologist. Your strawberry mark may be infected and swollen. Consult your primary doctor .alopecia is different condition and its cause usually not known .Best is talk to dermatologist about your problem for alopecia if he has some suggestion to prevent spreading of alopecia .