Hi, the area needs to be examined for proper diagnosis. Avoid applying dettol. Use antiseptic cream like soframycin instead. Repeated pimples/follicle infection on the neck may require long course of antibiotic tablets and specific creams. For now, avoid cutting the hair too close to the skin. Apply soframycin on the pimples for a few days. Use benxop wash to clean it during bath and see a local dermatologist when possible.