Well, I can't vouch for the diagnosis (if correct or not). However, if they are lipomas, I would personally not do anything with them.
Surgery, in this case, would be only cosmetic and serve no other purpose.
The only time I generally do a surgery to debulk a lipoma is if it is so large it is compromising the pets quality of life, or if it is in an area of high motion (inside an arm pit or inside a hind leg) and it is affecting the way a pet is walking.
Otherwise, I leave them alone.
Slow growth? No. Although, keeping him at an ideal body weight and not overweight can help.
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