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Psoriasis can indeed affect the inside of the mouth, including the lips, although it is relatively rare compared to other locations on the body. Psoriasis is a chronic autoimmune condition characterized by the rapid buildup of skin cells, leading to the development of thick, red, scaly patches on the skin. While psoriasis commonly affects areas such as the scalp, elbows, knees, and lower back, it can occur anywhere on the body, including mucous membranes like the inside of the mouth.

When psoriasis affects the lips or inside of the mouth, it may present as red or white patches, inflammation, and sometimes small, fluid-filled bumps. These symptoms can sometimes be mistaken for other conditions, such as cold sores or oral thrush.

If you suspect you may have psoriasis inside your lip, it's essential to consult with a healthcare professional for an accurate diagnosis and appropriate treatment. A dermatologist or oral healthcare provider can examine the affected area and recommend the best course of action.

Treatment for psoriasis inside the mouth may include topical corticosteroids, oral medications, or other therapies aimed at reducing inflammation and managing symptoms. In some cases, lifestyle modifications and avoiding triggers may also help manage the condition.

Since you mentioned that the condition has worsened over the past week, it's especially important to seek medical attention promptly. Persistent or worsening symptoms should always be evaluated by a healthcare professional to rule out other potential causes and ensure proper treatment.