These are from some websites but probably confirm your suspicions. I would take the take to a vet and little brother could use some antifungal cream or see a medical doctor. It may not be the snake but better be safe than sorry.
A number of fungal organisms can cause superficial and deeper infections of snakes. Most of these infections involve the skin and respiratory system. Fungal infections of the eyes are most likely to occur in snakes housed in damp, contaminated environments. Ringworm fungi that usually infect people, pets and livestock have also caused skin infections of snakes.
Ringworm is treated with antifungal medications including shampoo, cream, or oral medicine. Over-the-counter anti-fungal creams found in pharmacies can be used to treat this skin infection. It usually takes up to a week or so to clear. If the ringworm returns or seems to worsen, have your child's pediatrician evaluate it. Instead of putting cream on the skin, taking a medicine by mouth (tablets or liquids) may be necessary, particularly when the fungal infection involves the scalp.
Ringworm is contagious (spread to others) through direct contact with an infected person or animal. It can also be spread indirectly through contact with the clothes, combs, or brushes of others who have it. Once treatment has begun and the circular rash begins to shrink, the rash won't be contagious. Until then, however, a person with ringworm can spread it to others
A veterinarian must examine Snakes exhibiting problems with their skin and/or eyes as soon as possible. A microbial culture and a skin biopsy may be necessary to obtain a diagnosis. Treatment of fungal diseases involves use of topical and systemic (oral and/or injectable) antifungal agents. Prevention of fungal disease involves correcting underlying problems with husbandry.