Pox lesions on the wattle, comb and other non-feathered body parts are some of the lesions associated with fowl pox. Birds should be vaccinated against fowl pox from three to six weeks of age ...

In your case, from what you have presented, I highly suspect fowl pox infection ... sign of this disease is presence of wart like lesions on the surface of the skin of the head, comb, wattles ...