Poikiloderma of Civatte
You’ve probably never heard of Poikiloderma of Civatte, but we’re sure you’ve seen it before. This odd-sounding skin condition is characterized by hyperpigmentation, in the form of reddish-brown spots, as well as the dilation of finer blood vessels in the neck and prominent pores. Usually, only the front and side are affected, while the skin right under the chin, which is usually shaded and not often exposed to the sun, remains unaffected. Currently, scientists and doctors do not know what causes Poikiloderma of Civatte, although it is aggravated by sun exposure, perfumes, and hormones.