How do you get rid of cysts underneath your skin that are in your armpit area?

Surgery. The cysts may be hidraadenitis suppuitiva which does not respond well to oral or topical medications. If the condition is significant the best approach is to surgically remove the problem area.
Cyst Removal. Surgical excision of a sebaceous cyst is a simple procedure to completely remove the sac and its contents. There are three general approaches used: traditional wide excision, minimal excision, and punch biopsy excision.