Contact Dermatitis: Symptoms, Causes & Treatment
حساسية الجلد التماسية
Contact dermatitis is a red, itchy skin rash that appears after the skin touches an irritating or allergenic substance, such as certain metals, detergents, or cosmetics. It improves by avoiding the causative substance and topical treatment, and identifying the allergen is the key to preventing recurrence.
What is Contact Dermatitis?
Contact dermatitis is an inflammatory skin reaction that occurs when the skin touches a particular substance, producing a red rash and itching in the contact area. It is very common and differs from other types of eczema in that it is directly linked to contact with an external substance that can often be identified and avoided.
It has two main types: irritant contact dermatitis, the most common, which occurs when a substance directly damages the skin's protective layer such as detergents, strong soap, repeated water, and chemicals, and affects anyone with enough exposure. And allergic contact dermatitis, an immune reaction that occurs only in those allergic to a particular substance after prior sensitization to it, such as nickel in accessories, some perfumes and cosmetics, rubber, and certain plants.
Symptoms appear as redness, itching, and sometimes blisters or cracking and dryness in the contact area, and in the allergic type may be delayed a day or more after exposure. The key to both treatment and prevention is identifying and avoiding the causative substance, and the doctor may use patch testing to detect the allergen. Treatment includes avoiding the irritant, moisturizers, and topical corticosteroid creams to calm the inflammation, with improvement within weeks once the cause is removed.
Symptoms
- Redness and itching in the contact area.
- Blisters or oozing in acute cases.
- Dryness, cracking, and scaling in chronic cases.
- The rash borders often match the contact area.
Causes
- Direct irritants: detergents, strong soap, chemicals, repeated water.
- Allergens: nickel, perfumes, cosmetics, rubber, some plants.
- Repeated exposure to the causative substance.
Diagnosis
- Clinical diagnosis from the rash appearance, location, and exposure history.
- Patch testing to identify the allergen in the allergic type.
Treatment
Avoiding the cause
- Identifying and avoiding the irritant or allergen is the basis of treatment and prevention.
Topical treatment
- Moisturizers and corticosteroid creams to calm inflammation and itching.
- Cool compresses and antihistamines for itching when needed.
This content is educational and does not replace consulting a dermatologist.
Complications
- Secondary bacterial infection from scratching.
- Turning into chronic dermatitis with continued exposure.
- Impact on work in occupations exposed to irritants.
Prevention
- Avoiding the causative substance once identified.
- Wearing protective gloves when handling detergents and chemicals.
- Moisturizing regularly and using gentle, fragrance-free products.
When to see a doctor
See a doctor for a severe, widespread, or recurrent rash, or one that does not improve by avoiding the cause, or if signs of infection such as pus and warmth appear. Book an appointment with a dermatologist on ClinicsJo to identify the allergen by testing and set a treatment plan.