Diabetic Foot Ulcer: Early Warning Signs
A diabetic foot ulcer is an open sore or wound, usually on the sole, toes or heel. It often begins as a small blister, crack, callus or cut that goes unnoticed because of reduced sensation. Without prompt care, ulcers can become infected and, in severe cases, lead to amputation. Recognising early warning signs and acting quickly makes a big difference.
Quick answer
- Early warning signs include a blister or cut that is not healing, redness, swelling or warmth, thickened skin or callus with dark spots underneath, drainage on socks, a bad smell, or new pain or numbness.
- Anyone with diabetes who notices these should see a doctor promptly, even if the wound looks small.
Why Do Diabetic Foot Ulcers Happen?
- Neuropathy: reduced feeling means injuries go unnoticed
- Poor circulation: slows healing
- Pressure points: from tight shoes or foot shape changes
- High blood sugar: weakens healing and infection defences
- Dry, cracked skin: allows germs to enter
Early Warning Signs
- A blister, cut or crack that is not healing within a few days
- Redness or a change in skin colour
- Swelling of the foot or ankle
- Warmth in one area of the foot
- Thick callus, especially with dark or bloody spots underneath
- Fluid or blood stains on socks
- Unusual foot odour
- Ingrown toenails or fungal infections
- New or worsening pain, or sudden loss of feeling
Signs of Infection That Need Urgent Care
- Spreading redness
- Pus or foul-smelling discharge
- Fever or chills
- Black or dark skin around the wound
- High blood sugar that is hard to control
Seek medical care the same day if you notice these signs.
Who Is at Higher Risk?
- People with diabetic neuropathy
- Those with poor circulation or peripheral artery disease
- People with previous foot ulcers or amputations
- Those with foot deformities such as bunions or hammer toes
- Smokers
- People with poor sugar control
- Those with kidney disease
How to Prevent Foot Ulcers
- Check both feet every day, including soles and between toes
- Wash feet daily with lukewarm water and dry well
- Moisturise dry skin, but not between toes
- Never walk barefoot, even at home
- Wear well-fitting shoes and clean, soft socks
- Check inside shoes before wearing them
- Cut nails straight across
- Avoid self-treating corns or calluses
- Keep sugar, BP and cholesterol under control
- Have a yearly foot examination, or more often if high risk
Key Takeaways
- Foot ulcers often start as small, unnoticed injuries.
- Non-healing cuts, redness and swelling are warning signs.
- Infection signs need same-day care.
- Daily foot checks prevent problems.
- Never walk barefoot with diabetes.
Final Thoughts
Your feet carry you through life, and with diabetes they need daily attention. Small habits and early action can prevent serious complications. For diabetic foot assessment and care, you can consult Dr. Tamoghna Das, an internal medicine and cardio-diabetology specialist at Medcare Diabetes & Obesity Clinic.
This article is part of our guide to diabetic foot problems, written for patients and families in Bongaigaon.
FAQs
What does an early diabetic foot ulcer look like?
It may look like a small blister, red patch, crack or open sore, often on the sole or toes. There may be thick skin or a callus around it, and sometimes drainage on socks.
Why don't I feel pain from my foot wound?
Diabetic neuropathy reduces sensation, so you may not feel pain from cuts or blisters. This is why daily visual checks are essential for people with diabetes.
How quickly should I see a doctor for a foot wound?
See a doctor promptly for any wound that is not healing within a few days. If there is redness, swelling, pus, fever or a bad smell, seek care the same day.
Can I walk barefoot at home if I have diabetes?
It is safer not to. Walking barefoot increases the risk of cuts, burns and injuries you may not feel. Wear soft footwear even indoors.
Are calluses dangerous in diabetes?
Calluses can hide ulcers underneath, especially if there are dark or bloody spots. Do not cut them yourself. A doctor or podiatrist should manage them safely.
How often should my feet be checked by a doctor?
At least once a year for most people with diabetes, and more often if you have neuropathy, poor circulation or past ulcers. Check your own feet daily.
Sources
Medically reviewed by Dr. Tamoghna Das, MBBS, MD (Medicine) · Assam Council of Medical Registration No. 20276 · Last reviewed 18 October 2026
Medical disclaimer. This article is for general information only. It is not a diagnosis and is not a substitute for a consultation with a doctor. For advice about your own health, please book an appointment. Read our medical disclaimer.
Seek urgent care now, call 108 or 112, or go to the nearest emergency department if you have chest pain, sudden breathlessness, fainting, weakness on one side of the body, very high blood sugar with vomiting or drowsiness, repeated low blood sugar with confusion, or a foot wound with redness, swelling or fever.
