Inflamed & red around anus/bum, antifungal&diaper cream helped, now little red pimply dots, does not hurt or itch. swab negative, heat rash perhaps?

Dermatitis: Perianal dermatitis can be caused by moisture and/or friction. Try avoiding very tight clothing,keep the area clean and dry and apply a cortisone type ointment. Also avoid over exuberant wiping after a bowel movement and finish cleansing with warm water applications and then pat the area dry. If no improvement consult a proctologist or dermatologist.