Pruritus (Itch)

What is it?

Pruritus, commonly known as itch, is an unpleasant sensation that triggers the desire to scratch. It can range from a mild, temporary annoyance to a severe, chronic condition that significantly impacts quality of life. While everyone experiences occasional itching, persistent pruritus lasting more than 6 weeks is considered chronic and may indicate an underlying medical condition.

What does it look like?

Unlike many skin conditions, pruritus itself is invisible - it's a sensation rather than a visible sign. However, the consequences of scratching may be apparent:

• Red scratch marks (excoriations) on the skin
• Thickened, leathery skin (lichenification) in areas of chronic scratching
• Dark or light patches where repeated scratching has affected pigmentation
• Small bumps or nodules (prurigo nodularis) from repeated picking
• Dry, flaky skin if associated with skin conditions

Where does it appear?

Pruritus can occur anywhere on the body:

• Localized pruritus: Confined to specific areas such as the scalp, back, arms, or genital region
• Generalized pruritus: Affecting multiple body areas or the entire body
• Common patterns: Flexural areas (inner elbows, behind knees) in eczema; scalp in seborrheic dermatitis; lower legs in elderly patients

Associated features

Pruritus often occurs with other symptoms:

• Sleep disturbance due to nighttime itching
• Mood changes including irritability, anxiety, or depression
• Difficulty concentrating during daily activities
• Skin pain or burning sensation in some cases
• Fatigue from disrupted sleep and constant discomfort

When to see a doctor

Seek medical attention if you experience:

• Itching lasting longer than 2 weeks without obvious cause
• Severe itching that interferes with daily activities or sleep
• Generalized itching affecting your entire body
• Itching accompanied by unexplained weight loss, night sweats, or fatigue
• Signs of skin infection (warmth, pus, spreading redness)
• No improvement with over-the-counter treatments