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Hi, Welcome to Just Answer. I'm Chris, a small animal Vet based in the UK. I am reviewing your question and will get back to you as soon as possible
Sorry to hear this. Could you send me a picture of the area of concern?
These look like potentially cystic masses (keratinising lesions), which would explain the cyclic nature of the problem. Some dogs are prime to them. Unfortunately they sometimes rupture, bleed and get infected. Cleaning gently twice daily with a dilute chorhexidine solution (hibi scrub for example - available from pharmacies) would be advisible. If they still don't settle then sometimes antibiotics are required. Surgical removal if the only way to resolve them but is often not practical when there are multiple lesions.
I hope that answers your question? Please let me know if you need any further help or advice.