Atopic Dermatitis (Eczema): This is the most common cause of perivascular dermatitis, characterized by itchy, inflamed skin, and is often associated with allergies or asthma. The perivascular infiltrate seen in atopic dermatitis is a hallmark of the condition.

Contact Dermatitis: This condition occurs when the skin comes into contact with an allergen or irritant, leading to a perivascular dermatitis reaction. It's a common condition that can be either allergic or irritant in nature.
Psoriasis: Although psoriasis is primarily known for its thick, scaly plaques, some forms, like guttate psoriasis, can present with perivascular dermatitis, especially in the early stages.
Seborrheic Dermatitis: This condition causes scaly patches, red skin, and stubborn dandruff, and can sometimes present with perivascular dermatitis, particularly on the face.

Lymphoma (Cutaneous T-Cell Lymphoma): While rare, cutaneous T-cell lymphoma can present with perivascular dermatitis and is critical not to miss due to its severe prognosis if left untreated.
Vasculitis: Conditions like leukocytoclastic vasculitis can cause perivascular dermatitis and are important to diagnose early due to potential systemic involvement and complications.
Infectious Diseases (e.g., Syphilis, Lyme Disease): Certain infectious diseases can cause skin manifestations that include perivascular dermatitis. Early diagnosis is crucial for effective treatment and prevention of long-term complications.

Sarcoidosis: A condition that can affect multiple organs, sarcoidosis can rarely cause perivascular dermatitis as part of its skin manifestations.
Pityriasis Lichenoides: This is a rare skin condition characterized by small, raised bumps that can resemble perivascular dermatitis, particularly in its chronic form.
Granuloma Faciale: A rare condition that causes single or multiple, reddish-brown, well-demarcated plaques on the face, which can include features of perivascular dermatitis.