There are red dots and pain under the armpit consider herpes zoster or inter-rubbing rash caused by the patient can be injected drugs, oral drugs and topical drugs for corresponding treatment, as follows: 1. Herpes zoster: can take oral valacyclovir granules or famciclovir tablets, can also be static points ribavirin or acyclovir injection to strengthen antiviral treatment. If the rash is red in color, the patient may be treated with wet application of 0.9% saline. The disease can usually appear in clusters of small red dots and blisters, accompanied by pain; 2. Inter-rub rash: caused by inflammatory infections such as bacteria or fungi, patients need to wet-apply boric acid solution and apply clotrimazole ointment or clindamycin phosphate gel for treatment.