Hi,
The most common cause of rash is eczema, Also, it can be caused by different things such as Erythema toxicum,
Molluscum contagiosum, cellulitis, chicken pox, eczema,
erythema multiforme, hand, foot and mouth disease, impetigo,
keratosis pilaris ("chicken skin"), measles, molluscum contagiosum, pityriasis rosea, prickly heat, psoriasis, ringworm, scabies, scarlet fever,
slapped cheek syndrome or urticaria (hives).
Take care. Hope I have answered your question. Let me know if I can assist you further.
Regards,
Dr. Sam Salahia, Dermatologist