Richard should consider visiting a dermatologist if the mole on his shoulder has any of the following characteristics:
1. The mole has an irregular border: If the mole has an uneven or jagged border instead of a smooth and well-defined edge, it could be a sign of potential skin cancer or other skin issues. Irregular borders can indicate abnormal growth.
2. There is hair growing from the mole: Hair growing from a mole is not necessarily a cause for concern, but sudden changes in the mole, such as new hair growth, should be examined by a dermatologist. Changes in the appearance of a mole can be a warning sign.
It is essential to monitor moles for changes in size, color, shape, or symptoms like itching, bleeding, or pain. If Richard notices any of these changes, it is important to seek professional evaluation from a dermatologist. Regular skin checks and prompt medical attention for concerning moles can aid in the early detection and treatment of skin conditions.