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The bumps and water bubbles in the sweaty area (between legs and under arms) are mostly due to prickly heat or heat rash. The bumps and water bubbles are seen in heat rash. Jock itch is mostly a fungal infection. Treatment is different for both. Kids are prone to these due to excessive sweating, less water intake etc.
The treatment is -
- wear looses cotton clothing to avoid sweating
- tell him to take frequent baths and keep the areas dry
- do not apply thick creams in the area
- use lactocalamine or hyrocortsone ointment in the area (available over the counter)
If the symptoms worsen or do not improve, then you need to consult a doctor for need of antibiotics
Hope your son is doing better