Two hours later, I couldn't understand why my armpits were feeling itchy and irritated. I went to the bathroom for a look. A sea of red, raised, angry-looking bumps reflected back at me from the mirror. And then I remembered.
Rinsing with a lot of water helped. Spritzing with Rose Hydrosol afterwards helped even more, making the itching disappear almost immediately. Within 10 minutes, the raised bumps were no longer red, but it took many hours before they were gone.
Because I had completely forgotten about using the soap, there is no question in my mind that this reaction was purely physical. But, this was supposed to be a product for sensitive skin. I guess that makes my skin ridiculously, over-the-top, can't-handle-even-the-slightest-bit-of-commercially-made-soap sensitive. Then again, if this was supposed to be a product specifically for sensitive skin, what the heck was perfume doing in it ?!?
Never mind. I've learned my lesson. No longer shall I accept kind offers of soap 'for sensitive skin' from friends, family or strangers – no matter how stinky I may feel. It's just not worth it.
PS: Even though I know what it is, I see no reason to mention the name of the soap. It could probably have been just about any brand. The reaction I had was more likely due to the perfume than the soap.