mSWAT / BSA Calculator
Quantify skin burden at diagnosis and track response at follow-up visits.
Regional involvement (% of each region)
Enter the percentage of each body region covered by patch, plaque, or tumor.
| Region | BSA% | Patch ×1 | Plaque ×2 | Tumor ×4 |
|---|---|---|---|---|
| Head | 7 | |||
| Neck | 2 | |||
| Anterior Trunk | 13 | |||
| Arms | 8 | |||
| Forearms | 6 | |||
| Hands | 5 | |||
| Posterior Trunk | 13 | |||
| Buttocks | 5 | |||
| Thighs | 19 | |||
| Legs | 14 | |||
| Feet | 7 | |||
| Groin | 1 |
Scores
mSWAT
0.0
range 0–400
Estimated TBSA
0.0%
No measurable skin involvement
Illustrative band only — mSWAT has no validated severity cutoffs; interpret in clinical context.
mSWAT weights each region's involved area by the region's share of body surface area and by lesion type (patch ×1, plaque ×2, tumor ×4).