Thomas:
Technically, pimples within the scalp hair aren't acne. They are most likely folliculitis, as you suggested.
Exactly what blocks
folliclesFollicle development
Follicle stimulating hormone
Follicle stimulating hormone-ganirilex
Fsh
Hair follicle
Hair follicle anatomy
Hair follicle sebaceous gland, on or off the scalp, isn't
clearClear by design
Clear eyes
Clear eyes acr
Clear eyes clr
Clear-atadine
Clear-atadine children's. Skin and hair products usually are not at fault.
Oral or topical antibiotics may help, possibly supplemented by topical cortsione scalp lotions. You probably should consult a dermatologist about this, but you can expect to get useful advice.
Good luck.
Dr. R