A 40-year-old male patient presents with fatigue for 1 month, subjective muscle pain in both upper limbs with difficulty in lifting for 2 weeks, and diffuse dusky erythematous rash on the neck and anterior chest. The most likely diagnosis is:
A 40-year-old male patient presents with fatigue for 1 month, subjective muscle pain in both upper limbs with difficulty in lifting for 2 weeks, and diffuse dusky erythematous rash on the neck and anterior chest. The most likely diagnosis is: