Scab
Free Symptom Checker
with Physician-supervised AI
Reviewed By:
Yukiko Ueda, MD (Dermatology)
Dr. Ueda graduated from the Niigata University School of Medicine and trained at the University of Tokyo Medical School. She is currently a clinical assistant professor at the Department of Dermatology, Jichi Medical University, and holds several posts in the dermatology departments at Kyoto Prefectural University of Medicine, Komagome Hospital, University of Tokyo, and the Medical Center of Japan Red Cross Society.
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Blisters formed scabs after 1 week
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Content updated on Jan 4, 2023
About the symptom
A scab is a rough, dry protective crust that forms over a wound during healing. During the healing process, the tissue under the scab grows back and pushes out the scan to allow new skin to grow.
When to see a doctor
Seek professional care if you experience any of the following symptoms
Numbness / sensory disorder
Numbness of the body
Systemic rash
Fever
Possible causes
- Urticaria
An itchy, allergic rash with red bumps, also known as "hives". The causes are broad, ranging from foods and medications to viral infections and bee stings. In most cases, the rash disappears within 24 hours, however medical attention is needed if there is facial swelling or breathlessness.
- Keloids (including piercing keloids)
Excessive scar tissue growth after skin trauma. Keloids are more common on earlobes, chest, and back.
- Shingles
This disease is caused by the Varicella (or chickenpox) virus reactivating. It can be triggered by stress, aging, or a weakened immune system.
- Mucous membrane pemphigoid
- Mycobacterial infections (excluding TB)
- Autosensitization dermatitis
- Impetigo
- Pellagra
- Palmoplantar pustulosis
Related serious diseases
- Kawasaki disease
A disease caused by the body's immune system attacking the blood vessels. Kawasaki disease requires hospitalization for treatment and ultrasound scans. Regular follow-up scans are important to reduce the risk of future heart attacks.
Questions your doctor may ask about this symptom
Your doctor may ask these questions to check for this symptom
Do you have a scab?
Other Related Symptoms
Similar symptoms or complaints
Symptoms from the same body system / part
Symptoms treated by the same specialty
Reviewed By:
Yukiko Ueda, MD (Dermatology)
Dr. Ueda graduated from the Niigata University School of Medicine and trained at the University of Tokyo Medical School. She is currently a clinical assistant professor at the Department of Dermatology, Jichi Medical University, and holds several posts in the dermatology departments at Kyoto Prefectural University of Medicine, Komagome Hospital, University of Tokyo, and the Medical Center of Japan Red Cross Society.
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Seiji Kanazawa, MD, PHD
Obstetrics and gynecology (OBGYN)
National Center for Child Health and Development, Japan