The sudden appearance of the chalazion purple chin consider the following two situations: a. Consider is folliculitis, folliculitis can occur in the scalp, chin beard, etc., the main causative organisms include Staphylococcus aureus, occasionally also Staphylococcus epidermidis, Streptococcus, Pseudomonas infection, such as immune deficiency, poor local skin hygiene, sebum overflow, exposure to certain mineral oil, asphalt, coal tar, etc. can also lead to, because The local infection leads to inflammation, and the inflammation subsides leaving a gua-purple color, which can fade on its own later.