It's okay that it has been a month. Especially since he is in the process of shedding. If you feel like there is stuck shed or he is having trouble completing the shed, you can up the humidity or give him a session in the shower.
As Jpowell stated, extra humidity and mistings will help with the shedding. The skin will absorb the added moisture and start releasing the old skin. NEVER try and "help" by pulling any skin off. This could damage the new skin underneath.