Dear Friend, I have gone through your query and i understand your concern. Firstly let me say there is a close resemblance between Atopic dermatitis and Scabies. These are distinguished by their are of spread. Are the so called pimple like rashes appearing in a line lying close to each other? If they are present in the armpit, waist , wrists along with increased itching at night and also aggravated by warmth, there are high chance that it might be scabies. Please do take a second opinion with another expert as soon as possible. On either case, as a homeopath, i would suggest a suitable potency of medicine Hepar sulp or Sulphur after considering more details of the case. This would prevent further recurrence of the rashes. I hope your query was answered. Please fell free to share your concern and feedback, Wish your son good health.