You should do as Niels stated above. You shouldn't give up. You must be responcible and care for him anyway you can. A lot of people claime that Pacmans are easy and a good starter frog, but you would not believe the number of people who come here having similar problems or worse. Pacmans as well as all other species of frog come with a huge responcibility. Far more than any dog or cat.we can help advise you on what to do ,but we can't make you fallow our instructions. If I were there I may be able to find a reason for his discomfort. Albinos can be hard to dianose skin discoloration if it is the same as one of the colors on the frog like pink and lite red.

At this point I'm going to tell you to give him a luke warm soak with Honey. 3 drops disolved in de-chlorinated water. The water needs to be up to his throat. He needs to soak for 10 minutes. You can do this in a bowl or container outside his enclosure. Sometimes this bath reduces stress.

His temps need to be no less than 80 during the day and no lower than 78 at night. This also will reduce stress because he will be warm. You need to maintain correct temps and humidity levels.

Lastly seek a herp vet because I believe that he needs to be seen to make sure that he has no infection of the skin or other problem. This is all I can do from here. Keep us posted.