1. What is the Palm Method for BSA Calculation?

The palm method is a simple way to estimate the percentage of body surface area affected by eczema. One palm (including fingers) represents approximately 1% of total body surface area in adults.

2. How Does the Calculator Work?

The calculator uses the palm method equation:

Explanation: Simply count how many palm-sized areas are affected by eczema to estimate the percentage of total body surface area involved.

3. Importance of BSA Assessment in Eczema

Details: Measuring affected BSA helps clinicians assess eczema severity, monitor treatment response, and guide therapeutic decisions. Eczema affecting >10% BSA is generally considered moderate-to-severe.

4. Using the Calculator

Tips:

• Examine the entire body and count each palm-sized affected area
• For smaller areas, estimate fractions of a palm (e.g., 0.5 for half-palm)
• For children, remember their palms represent a larger percentage of total BSA

5. Frequently Asked Questions (FAQ)

Q1: How accurate is the palm method?
A: It provides a good clinical estimate, though exact measurements may vary slightly between individuals.

Q2: Does this work for children?
A: The palm method can be used, but remember a child's palm represents about 1.25% BSA for younger children and 1% for adolescents.

Q3: What about very small or large affected areas?
A: For small areas, estimate fractions of a palm. For large contiguous areas, visualize how many palms would cover it.

Q4: How does BSA relate to eczema severity?
A: Generally: mild (<10% BSA), moderate (10-30% BSA), severe (>30% BSA), though symptoms also matter.

Q5: Are there alternative methods?
A: Yes, the Rule of Nines is another method, but the palm method is more precise for eczema assessment.