If its a 2nd hand suit it could be a seam so no bubbles from soapy water will show etc.
It could also be a dodgy neck or wrist seal.
Like i said, try standing in the shallow end of the pool for a few minutes, get out, see if bottom half is wet. If it is, theres a leak down there. If not, its higher up.
Try submerging yourself for maybe a minute or 2, get out, remove suit, you should see a damp patch around the affected area before its spread too much.
Failing that, try turning it inside out and filling it with water, that WILL squeeze out through seams and small holes.
It could also be a dodgy neck or wrist seal.
Like i said, try standing in the shallow end of the pool for a few minutes, get out, see if bottom half is wet. If it is, theres a leak down there. If not, its higher up.
Try submerging yourself for maybe a minute or 2, get out, remove suit, you should see a damp patch around the affected area before its spread too much.
Failing that, try turning it inside out and filling it with water, that WILL squeeze out through seams and small holes.