Baby Skin & Body CareA blog on baby care

Does anyone know what this could be? They sort of started off as red spost and turned black. He is outside mostly and I bathe him once a week and use baby shampoo and also Sergeants tick and flea shampoo for fleas as he constanly plays with stray cats. I use Frontline on him but doesn’t seem to do anything for the fleas. Someone told me to use Avon Skin so Soft, so I just tried that this week and see if it repells the fleas.
Will these black spots go away? They started at the bottom of him belly and when I bathed him on Saturday I noticed they are now all over his back too. Not sore or raised, just flat black spots.
He is white and brown/gold.
Please help!

for porkchop who answered tea tree oil shampoo, can you give more detail on which brand. Also, dog food what do you choose and where you buy the vitamin and what kind. Thanks alot.