I also refer to these as "energy eggs" as they have (at least for me) a rather oblong shape at times. These are concentrations of energy traveling up the spine. Sometimes a prelude to a more auspicious infusion.
They are part of the process and nothing is wrong should you feel them and they are tactile. As if there is a round or oblong "object" traveling up your spine, these energy eggs will stop or exit out a specific chakra. This is usually accompanied by tingles and waves of pleasure extending throughout various regions of the body far from where this energy stops.
It is indicative of subtle Kundalini movement. Not anything to be concerned with and more to be enjoyed as there are definite pleasures associated with them.
As you feel these energy bubbles begin to rise, typically from the base of the spine, go into the "finger lock", the "tongue" lock and as you begin to look up into the "eye lock" gauge the ocular lock in a way as a determining factor with regards to the energy eggs rate of rise with in you.
So if you feel it at your first rising to your second and it stops there, use the eye upward position to increase the energy eggs range of "rise" along your spine. As you practice the eye lock and the tongue lock you will develop a range of positions from which to choose from inside those specific positions. So for the eye lock a person will be able to look higher or not so high or straight ahead.
These positions with regards to the eye lock will have a determining factor with the rate and height of the energy egg along the spine. You may find that certain combinations of upward eye positioning will be needed to "encourage" the energy bubble to continue its path. If it doesn't move then it is at its destination and this is where it is needed.
As these bubbles are raised the body may become very, very sensitive to the energy with in them. The body will often spasm as these eggs or bubbles are released into a given area. This will have the texture of a ticklish feeling and yet the body will spasm and convulse, as it is a very strong and concentrated form of energy being dispersed into the surrounding nadis and nervous structures.
You will literally jerk around as this occurs. No worries. This is the physical response to such an incursion and will taper out as time goes by and the body acclimates to these energetic sensations. - blessings - chrism
These are concentrations of energy traveling up the spine.