Same here, almost always acne on forehead/scalp day 2-5 after orgasm. Actually thats my second worst problem now after the headache. They are deep ones so I dont think they are caused by pores or sebaceous gland. The cause is substances in the blood (that cause thick blood and pooling) possible in combination with decreased immune system and leaky gut. I havn't noticed what cause more acne (O or NE) but I have figured out what can hold it back. By meticulous folloing this protocol:
Drink 3 liter water each day (to keep the blood thinner)
Take 0,5 dl colloidal silver morning and night, keep 1 minute in mouth. If you dont want to drink it, at least keep it in the mouth for 1-3 minutes before you spit it out.
3 000-6 000 mg vitamin C per day
Keep the blood circulation going, specially on your forehead/scalp all day. Regulary wash your face and gently massage it (the acne seems to start when the blood is pooling) and take walks (>5 000 steps/day)
3 tablespoons of Omega 3 per day (to keep the blood thinner)
Intermittent fasting (don't eat between 4pm and 10am)
Just eat fluently foods (soups, smoothies), not heavy meat things.
No cream can help this as it comes from the blood within you.