Hi doctor, i have a "hickey-like" rash or mark right under my chin. its red/dark redish and it hurts to look up because its right under my chin. ?

Rash is tricky: and cannot be diagnosed or even suggested for diagnoses without visualization. Usually you would need for a healthcare provider to see and feel it before an attempt at diagnosis and treatment can be made. This is because there is a high change of misdiagnosis even if it is seen and felt by a physician. Lots of rashes look and sound alike !! Thanks for trusting in HealthTap.