There are many forms of warts. But they all have something in common as they are a result of a virus. They can be anywhere on the body to include genital warts

. It is abnormal growth and if he has them on most of his body he also has a autoimmune system problem. My advice is DO NOT TAKE HGH unless he has a strict supervision from a specialist endo & dematologist ect.. He must not take this lightly as HGH may cause more growth as most are beneigh not malniglant. However ,there is a possible flip side to all this where as HGH may offer some help. Immune disorders can originate(mostly) from the thyroid,
and HGH does affect the thyroid. Some studies have shown positive therapies with deseases and is therorized it has something to do with the thyroid. Bottom line is he should not take HGH without professional counselling.