Which condition requires immediate physician referral due to its contagious nature?

Molluscum contagiosum is caused by a poxvirus and is highly contagious, particularly in close-contact environments such as sports or school settings. This viral infection presents as small, raised lesions on the skin that can easily spread to other individuals through direct skin-to-skin contact or through shared objects, such as towels or sports equipment. Due to its contagious nature, it is crucial to refer individuals with this condition to a physician for appropriate diagnosis and treatment. Management may include options such as cryotherapy or topical treatments to limit the spread and resolve lesions.

In contrast, while common warts are also caused by a virus, they are generally not as contagious as molluscum contagiosum and often do not require immediate medical intervention unless they cause discomfort or significant cosmetic concern. Allergic contact dermatitis and irritant contact dermatitis are reactions to substances rather than infections and are not contagious; therefore, they do not necessitate a physician referral for contagiousness.