DM symptoms include:

• Muscle weakness – The weakness affects both sides of the body and usually happens slowly over time. It involves muscles closest to the middle of the body, such as those in the neck, shoulders, hips and thighs. Depending on the muscles involved, patients may have trouble climbing stairs, lifting things overhead, or swallowing.
• DM can cause other types of long-term medical problems too, such as lung and heart problems, so it’s important to see a doctor and get diagnosed as soon as possible.
• Skin rashes – The rashes are red, sometimes scaly and patchy, and usually very itchy. Sunlight usually makes the rashes worse. DM causes different kinds of skin rashes on different parts of the body, such as:
  • Fingers, including on the backs of the finger joints and around the fingernails
  • Elbows and knees
  • Upper eyelids
  • Neck, upper chest or upper back
  • Scalp

PM symptoms include:

• Muscle weakness – The weakness affects both sides of the body and usually happens gradually over time. It involves muscles closest to the middle of the body, such as those in the neck, shoulders, hips and thighs. Depending on the muscles involved, patients may have trouble climbing stairs, lifting things overhead, or swallowing.