1. You did the right choice in popping the cysts acne. But make sure to pop the right way to prevent scarring.
2. Immune system falsely identify p.acne as a threat hence attack signal triggered.
3. Clogged up pores lead to oil gland burst and inflame.
4. Oily food, dairy products, sugary, lack of certain enzyme or receptors lead to build up toxin at inflammed areas.
5. Frequent washing doesnt help cause cystic acne is underlying skin problem. AHA might help at least clear up clogged pores and minimise the chance of having acne.
6. Cystic acne is usually internal problem which is not easily come to head.