# Skin in Renal Disease

> Skin in renal disease for NEET-PG Dermatology covers uraemic itch, calciphylaxis, nephrogenic systemic fibrosis and perforating dermatosis in dialysis patients.

- Canonical URL: https://prepelephant.com/topics/neet-pg/dermatology/skin-in-renal-disease
- Exam / course: NEET-PG · Subject: Dermatology
- Publisher: PrepElephant (https://prepelephant.com) — Prepared and reviewed by the PrepElephant Academic Review Team
- First published: 2026-10-14
- Last updated: 2026-10-14
- Reference basis: Brenner and Rector's The Kidney; Fitzpatrick's Dermatology
- How to cite: "Skin in Renal Disease", PrepElephant, https://prepelephant.com/topics/neet-pg/dermatology/skin-in-renal-disease

## Direct answer

Skin in renal disease is dominated by uraemic pruritus, xerosis and pallor, with calciphylaxis and nephrogenic systemic fibrosis as the two serious conditions a dermatologist must recognise. Calciphylaxis is calcification of small arterioles that causes painful violaceous plaques and necrotic ulcers, and it carries high mortality. Nephrogenic systemic fibrosis follows gadolinium-based contrast in severe kidney failure, producing skin thickening and joint contractures.

## What you must remember

- **Uraemic pruritus:** multifactorial and very common in dialysis patients, managed with emollients, UVB phototherapy and neuromodulators such as gabapentin.
- **Calciphylaxis:** calcification of small vessels with painful livedo, violaceous plaques and necrotic eschars, linked to female sex, obesity, warfarin and hyperphosphataemia.
- **Calciphylaxis risk:** secondary hyperparathyroidism and high phosphate, with diabetes and vitamin K antagonists as additional factors.
- **Calciphylaxis management:** stop warfarin, correct phosphate and parathyroid hormone, give sodium thiosulfate and provide wound and pain care.
- **Nephrogenic systemic fibrosis:** skin thickening, induration and contractures after gadolinium exposure in severe kidney disease.
- **Gadolinium safety:** group I gadolinium agents carry the recognised NSF risk, so they are avoided in severe renal impairment.
- **Acquired perforating dermatosis:** itchy keratotic papules that are extruded through the epidermis, most often in dialysis patients.
- **Uraemic frost and xerosis:** urea crystals on the skin are now rare with good dialysis, while dry skin and anaemia-related pallor are common.

## A diagnostic approach to a painful dialysis plaque

A dialysis patient with a painful dark plaque is treated as calciphylaxis until proven otherwise. The steps move from bedside recognition to treatment.

1. **Recognise the plaque:** look for painful, violaceous, livedo-like areas that may progress to necrosis and eschar.
2. **Check the mineral axis:** measure calcium, phosphate, parathyroid hormone and alkaline phosphatase, since the abnormal values drive the vessel calcification.
3. **Review the drugs:** note warfarin, vitamin K antagonists, calcium-based binders and corticosteroids, all of which change the risk and the plan.
4. **Biopsy with caution:** histology shows calcified small vessels and thrombosis, but a biopsy can start a non-healing ulcer, so it is reserved for doubtful cases.
5. **Treat aggressively:** stop warfarin, correct phosphate, give sodium thiosulfate and start wound care with analgesia.
6. **Involve the team:** nephrology, vascular surgery and palliative care share decisions, because mortality is high.

Calciphylaxis is an emergency in the sense that delay costs tissue and life. The same patient may also have uraemic pruritus, so the team addresses both the vessel disease and the itch.

## Where the exam tries to catch you

Stems test whether you can recognise a serious vascular disease in a dialysis patient and avoid a dangerous contrast agent.

- **Trap:** treating a painful dialysis ulcer as a routine pressure sore. **Correct:** calciphylaxis causes painful necrosis with livedo, so check the mineral profile and review anticoagulation.
- **Trap:** giving gadolinium contrast to a patient with severe kidney failure without thought. **Correct:** group I agents carry the NSF risk, so choose an alternative with the radiology team.
- **Trap:** treating uraemic itch with topical steroids alone. **Correct:** the itch is systemic, so improve dialysis adequacy and add phototherapy or neuromodulators.

## Frequently asked questions

### Which drug is strongly linked to calciphylaxis?

Warfarin is strongly linked to calciphylaxis, alongside hyperphosphataemia, hyperparathyroidism, obesity and female sex. Stopping warfarin is a key early step when calciphylaxis is suspected, since it removes a major driver of vessel calcification.

### What causes nephrogenic systemic fibrosis?

Nephrogenic systemic fibrosis is caused by exposure to gadolinium-based contrast agents in patients with severe kidney failure. It produces skin thickening, induration and contractures, and group I gadolinium agents carry the highest recognised risk.

### What is acquired perforating dermatosis in renal failure?

Acquired perforating dermatosis is an intensely itchy eruption of keratotic papules that are extruded through the epidermis, seen mostly in dialysis patients. Treatment targets the itch with topical steroids, antihistamines and better dialysis control.

### How is uraemic pruritus managed?

Uraemic pruritus is managed by improving dialysis adequacy, using emollients and UVB phototherapy, and adding neuromodulators such as gabapentin or kappa-opioid agonists in selected patients. Topical steroids alone rarely control the itch of uraemia.