Your concern is What is hyperhidrosis? Hyperhidrosis ,is the medical term for excessive (too much) sweating. We usually sweat to keep our body temperature constant. Sweat evaporating from the skin creates a cooling effect for the body. When the body is producing much more sweat than it needs to keep cool, this is called hyperhidrosis. Hyperhidrosis most commonly affects children, teenagers, and young adults. Its onset can occur at any age and developmental stage. Increased sweating may be triggered by certain things such as anxiety, spicy foods, cola drinks, exercise, warm air temperature, and fever. You may or may not be able to identify a specific trigger in your child. You should see a doctor if you think that the amount of sweat being produced is more than is needed to keep the body at a constant temperature. WIth his obesity ( you have not mentioned his weight and family history ) we have to investigate for Type 1 Diabetes in him esp if any family member had it. Please come back with all details as on a personal talk with your doctor. Just asking a few questions online cannot help give a scientific answer. Regards. YOu have already discussed with many doctors and I hope they have asked some questions before asking any test and deciding on their action. Take care.