A pharmacologist or pharmacist is a specialist in medication.
A skin specialist is a "dermatologist".
A vocal specialist is called a Speech Therapist
A neonatologist is a specialist in the care of newborns.
A neonatologist is a specialist in the care of the newborn.
A gerontologist is a specialist in the treatment of the elderly.
A cardiologist is a heart specilist.
Myologist is the term meaning specialist in the study of muscles, but an orthopedist is the typical specialist physician who treats muscle problems.
Dermatologist
neurologist
A pulmonologist is the medical specialist who treats the lungs and trachea.
A consultant from the G.U medicine will treat Hiv and Aids patients. However they will be cared for on specialist wards, such s infectious Diseases.
A cardiologist.