Long chicken pox half a month after the black marks have not disappeared, belong to the normal phenomenon, may be chicken pox has not completely subsided, but also may be left behind the acne marks, can be treated through active treatment of chicken pox, reduce sun exposure, medication (cumulonimbus cream, etc.) and other measures to treat. 1. Chickenpox hasn’t subsided completely: If chickenpox hasn’t subsided completely, it will cause the area to remain bad. It can be treated with oral medication such as acyclovir and vasiclovir. 2. Pimple marks: skin because of inflammatory reaction, the part of the skin will leave hyperpigmentation, due to the different skin metabolism of each person, some people may need two or three months or so for the pimple marks to completely subside. You can apply hydroquinone cream, tranexamic acid and other drugs to assist in the treatment, usually pay attention to reduce ultraviolet radiation, to promote the part of the pigmentation subside. It is recommended that long chicken pox left black marks of patients timely consultation, actively under the guidance of the doctor to carry out the appropriate treatment, not indiscriminate use of drugs, usually pay attention to sunscreen.