Choosing a natural soap for sensitive skin

If your skin gets tight, itchy, or flushed after a shower, the bar is a reasonable place to look first. Not because soap is villainous, but because a lot of what is sold as soap is doing more than cleaning.

Walk the aisle and you will see the word 'beauty bar', 'cleansing bar', or 'deodorant bar'. Those are usually synthetic detergent bars. They lather beautifully and they strip efficiently, which is the same sentence twice.

True soap is fat plus an alkali, saponified. The result is milder, rinses cleaner, and leaves the skin's own oils in better shape.

Fragrance, first, for the disclosure reasons we covered in our label guide. Then heavy essential oil loads, which are natural and still perfectly capable of irritating reactive skin. Then dyes and glitters, which do nothing for cleaning.

Also look at how a bar is superfatted. A bar made with a little extra oil left unsaponified will feel gentler than one squeezed for maximum lather.

Tallow makes a hard, long-lasting bar with a creamy, low lather and a fatty acid profile that sits comfortably against skin. It has been the backbone of household soap for centuries, and it fell out of favor for cost and marketing reasons more than performance ones.

Colloidal oats add slip and a soft feel in the water. They are one of the oldest recorded skin comforts there is, and they are cheap, boring, and effective — our three favorite qualities.

Use it on one forearm for three days before it touches your face or a child's skin. Do not change anything else at the same time — no new lotion, no new laundry soap — or you will not know what caused what.

Give it two weeks before you judge. Skin that has been stripped for years often goes through an adjustment before it settles, and one shower does not tell you much.

Nothing here is medical advice, and if you have a diagnosed skin condition, your dermatologist outranks us.

A handmade bar left sitting in water turns to mush and you will blame the soap. A draining dish out of the shower stream doubles its life, easily.