Inclusion Criteria:  Pompe disease:  Confirmed diagnosis of Pompe disease From 18 years of Age Independent from current therapy  Muscular dystrophy:  Genetically confirmed diagnosis From 18 years of Age Independent from current therapy  Health volunteer:  From 18 years of Age, matched (age, gender) to PD collective  Exclusion Criteria:  Pompe disease:  Pregnancy Tattoo on skin to be examined  Muscular dystrophy:  Pregnancy Tattoo on skin to be examined  Health volunteer:  Anamnestic of other signs of myopathy or liver disease Pregnancy Tattoo on skin to be examined