In my previous comment I think I meant to say that I didn't use MMS straight, but activated it first.
I used about 10 drops of the MMS then the usual activator of citric acid [5 drops citric acid to 1 drop MMS]. Left it to activate for a little over 3 minutes.
Sounds like you are using 10% citric acid, a very old type of MMS activator. More recently 50% citric acid 1:1 has been used. Currently, the G2C recommends using 4% HCL to "activate" MMS.
If you have not seen the results of my testing some years ago on MMS activation time vs CLO2 ppm, take look
here
. You will see that after "activation" there is a lot of unreacted MMS remaining and MMS will burn your skin in a short time. 1 drop of MMS can contain 6.7 mg of CLO2 (24 drops = 1 ml). The tests used 3 drops of MMS so 20.1 mg of CLO2 should be available. The second chart shows much less released from external activation.
That is why I suggest using CDS for skin use instead of MMS1. MMS1 is best used internally where stomach acid can release the remaining CLO2 contained in unactivated MMS (22.4% sodium chlorite).