Itchy Rash or Blisters on a Diabetes Pill?The Gliptin Warning for Bullous Pemphigoid

Bullous pemphigoid is a skin disease that usually starts after 60 and causes repeated crops of blisters.¹ It often starts with itch alone, sometimes for weeks or months, and about 1 in 5 people never get blisters at all, only itch or a rash that can look like hives or eczema.¹

The diabetes pill link

DPP-4 inhibitors, also called gliptins, are diabetes pills. Generic names include sitagliptin, linagliptin, saxagliptin and alogliptin. Their labels warn about bullous pemphigoid, including cases that needed a hospital stay.² In reported cases, people usually recovered after the medicine was stopped and the skin was treated.²

How big is the risk?

Study	What it found
U.S. insurance and Medicare data, 1.66 million people (2020)	About 0.42 cases per 1,000 people per year on a gliptin vs. 0.31 on a comparison diabetes pill3
Same study, age 65 and older	0.79 vs. 0.49 per 1,000 per year3
Same study, linagliptin users	1.20 vs. 0.55 per 1,000 per year3
138 randomized trials (2020)	17 cases on gliptins vs. 1 on comparison treatments4

So the risk is rare, but it’s higher with age, and some data point most strongly to linagliptin.³⁴ Other gliptins can’t be ruled out.⁴

What to watch for

• Itching that won’t settle, especially if it’s new since starting a diabetes pill¹
• A rash that looks like hives or eczema¹
• Tight, firm blisters that don’t pop easily, often on the arms, legs, belly, armpits or groin¹
• Raw, open spots where skin has broken down²
• Blisters that look dusky pink, brown or black on darker skin¹

Our guides to dry, itchy skin and hives cover more common causes.

If you notice these

1. Call your prescriber and mention your diabetes pill by name. The label tells patients to report blisters or skin erosions.²
2. Don’t stop it on your own. If pemphigoid is suspected, the label says the medicine should be stopped and a dermatologist referral considered.² Your prescriber can switch you to another option.
3. Ask about a skin biopsy to confirm the diagnosis. Treatment can ease the itch and reduce flare-ups.¹ See our blister care and medicine plan.

Try: “I’ve had itching on my arms and belly for six weeks, and I take linagliptin. Could this be bullous pemphigoid, and should I switch diabetes medicines?”

Skin, Head to Toe includes a short-shelf planner and a 12-week SkinLog. Use them to note when the itch started and photograph any rash or blisters to show your prescriber. See the book.